334 EXPERIMENTS AT SPITZBERGEN. 



position by means of a screw attached to the 

 hindermost leg, and a level fixed to the agates. 

 There was a contrivance also for making the 

 usual lateral adjustment for equalising the beats ; 

 and the experiments were all made with the 

 same face of the pendulum outwards. The baro- 

 meter, thermometer, and arc of vibration, were 

 observed every two hours. 



Immediately before the embarkation of the 

 clock, it was put up in the house of the late 

 Henry Browne, Esq., F.R.S., in Portland Place, 

 London, and the number of vibrations in twenty- 

 four hours, mean solar time, was 86384,41 ; ther- 

 mometer, Farht. 48° 8 ; arc 1° 31. 



After the voyage, (Dec. 1818,) it was put up 

 in the same house ; and the number of vibrations, 

 as before, was 86380,5; ther. 47° 1; arc 1°616. 

 It was afterwards taken down, and put up again 

 in the following March, when the number of 

 vibrations was 86379,8 ; ther. 57° 3 ; arc 1° 55. 

 These results were obtained by a comparison 

 with an excellent clock made by Cummings, 

 regulated by transit observations. 



Corresponding observations were made at three 

 different places on the coast of Spitzbergen, 

 at a few miles' distance from each other ; at 

 two of which, from the very unfavourable state 



